Add preliminary Top Shelf imagery for retina Apple TV

(cherry picked from commit 6b0aed5cb738beea856fa6ac815d9de6dcb536d8)

Apple-TV/Assets.xcassets/App Icon & Top Shelf Image.brandassets/Top Shelf Image Wide-1.imageset/Contents.json

@@ -7,6 +7,7 @@
     },
     {
       "idiom" : "tv",
+      "filename" : "TopShelf_wide@2x.png",
       "scale" : "2x"
     }
   ],

Apple-TV/Assets.xcassets/App Icon & Top Shelf Image.brandassets/Top Shelf Image.imageset/Contents.json

@@ -7,6 +7,7 @@
     },
     {
       "idiom" : "tv",
+      "filename" : "TopShelf@2x.png",
       "scale" : "2x"
     }
   ],